Add example WAMIT input files for the hd_NBodyMod* r-tests

modules/hydrodyn/hd_NBodyMod1/WAMIT_Input/README.md

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+The example WAMIT input files provided here are compatible with Version 6.1.
+
+Note that these are not the original WAMIT input files used to generate the hydrodynamic coefficients included with the r-test, but they should be equivalent.

modules/hydrodyn/hd_NBodyMod1/WAMIT_Input/fnames.wam

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+semi_4body.cfg
+semi_4body.pot
+semi_4body.frc

modules/hydrodyn/hd_NBodyMod1/WAMIT_Input/semi_4body.cfg

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+ ipltdat=5
+ maxscr=1024    (assign a maximum block of 1024*1024 RAM for scratch LHS)
+ I2ND=0         (second-order)
+ IALTPOT=2      (use the second form of the .pot file)
+ IALTFRC=2      (use the second form of the .frc file)
+ ISOR=0         (evaluate source strength, required for 2nd order)
+ ISOLVE=1       (use direct solver)
+ ISCATT=0       (solve for total diffraction potential, not scattering)
+ IQUAD=0        (omit IQUAD in POT file, use single-node quadrature)
+ ILOG=1         (omit ILOG in POT file, integrate log singularity)
+ IDIAG=0        (omit IDIAG in POT file, panel length based on area)
+ IRR=1          (omit IRR in POT file, irregular-frequency removal)
+ IPERIO=2       (input frequencies in radians per second)
+ ILOWHI=1       (use low-order panel method)
+ ILOWGDF=1      (write low order gdf)
+ PANEL_SIZE=2.0 (average length of panel)
+ MONITR=0       (do not write FORCE output data to monitor)
+ NUMHDR=0       (write headers to numeric output files)

modules/hydrodyn/hd_NBodyMod1/WAMIT_Input/semi_4body.frc

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+semi_4body.frc
+ 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0  IOPTN(1-16)
+ 1025   RHO
+ 0      0      0      XCG
+ 0      IMASS
+ 0      IDAMP
+ 0      ISTIF
+ 0      NBETAH
+ 0      NFIELD

modules/hydrodyn/hd_NBodyMod1/WAMIT_Input/semi_4body.pot

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+semi_4body.pot
+200.0                           (HBOT)
+ 1           1                  (IRAD, IDIFF)
+ -202                           (NPER          - Number of wave periods to be analyzed {0: evaluate hydrostatics only, >0: evaluate for NPER wave periods where PER is a list, <0: evaluate for ABS(NPER) wave periods where PER(1) is the first value and PER(2) is the uniform increment} (-))
+ -0.02 0.02                     (PER           - List of wave periods [IPERIN = 1] or wave frequencies [IPERIN = 2] or infinite-depth wavenumber [IPERIN = 3] or finite-depth wavenumber [IPERIN = 4] {0.0: infinite frequency, <0.0: infinite period} [1 to NPER when NPER>0 or 1 to 2 when NPER<0] (sec when IPERIN = 1, rad/s when IPERIN = 2, - when IPERIN = 3, or - when IPERIN = 4) [this line must be deleted when NPER=0])
+  37                            (NBETA         - Number of wave heading angles to be analyzed {0: do not solve the diffraction problem [this is the same as IDIFF=-1], >0: evaluate for NBETA wave angles where BETA is a list, <0: evaluate for ABS(NBETA) wave angles where BETA(1) is the first value and BETA(2) is the uniform increment} (-))
+-180.0
+-170.0
+-160.0
+-150.0
+-140.0
+-130.0
+-120.0
+-110.0
+-100.0
+ -90.0
+ -80.0
+ -70.0
+ -60.0
+ -50.0
+ -40.0
+ -30.0
+ -20.0
+ -10.0
+   0.0
+  10.0
+  20.0
+  30.0
+  40.0
+  50.0
+  60.0
+  70.0
+  80.0
+  90.0
+ 100.0
+ 110.0
+ 120.0
+ 130.0
+ 140.0
+ 150.0
+ 160.0
+ 170.0
+ 180.0                          (BETA          - List of wave heading angles relative to the global coordinate system [1 to NBETA when NBETA>0 or 1 to 2 when NBETA<0] (degrees))
+ 4                              NBODY
+  semi_center.gdf               GDF FILE NAME
+0.0  0.0  0.0  0.0              XBODY(1-4)
+ 1  1  1  1  1  1               IMODE(1-6)
+ 0                              NEWMDS
+  semi_col.gdf                  GDF FILE NAME
+ 14.433756729740645  25.0  0.0  0.0  XBODY(1-4)
+ 1  1  1  1  1  1               IMODE(1-6)
+ 0                              NEWMDS
+  semi_col.gdf                  GDF FILE NAME
+-28.867513459481287   0.0  0.0  0.0  XBODY(1-4)
+ 1  1  1  1  1  1               IMODE(1-6)
+ 0                              NEWMDS
+  semi_col.gdf                  GDF FILE NAME
+ 14.433756729740645 -25.0  0.0  0.0  XBODY(1-4)
+ 1  1  1  1  1  1               IMODE(1-6)
+ 0                              NEWMDS