Added the license and latest-release badges

Signed-off-by: Bob Yantosca <[email protected]>

Signed-off-by: Bob Yantosca <[email protected]>

Signed-off-by: Bob Yantosca <[email protected]>

scripts/isCoards:
- Removed several debugging print statements that were leftover
  from diagnosing an previous bug.

Signed-off-by: Bob Yantosca <[email protected]>

scripts/isCoards
- Add code to parse the variable type from the ncdump output. If "int"
  is found, add a message to the @bad array that this is not allowed
  for GCHP.
- Also trimmed trailing whitespace

Signed-off-by: Bob Yantosca <[email protected]>

CHANGELOG.md
- Removed old text carried over from GEOS-Chem repository
- Added up-to-date version information

Signed-off-by: Bob Yantosca <[email protected]>

scripts/isCoards
- Exit the script if the input file is not found.  This can give
  erroneous output.
- Update the "for more info" footer displayed on the screen to point
  to geos-chem.readthedocs.io instead of the GEOS-Chem wiki.  The wiki
  documentation has since been ported to RTD.

Signed-off-by: Bob Yantosca <[email protected]>

scripts/isCoards
- Added double quotes around"Work with netCDF files" and "Prepare
  COARDS-compliant netCDF files".  Cosmetic change.

Signed-off-by: Bob Yantosca <[email protected]>

scripts/isCoards
- Update GCHP-related messages with either "(requirement for GCHP)"
  or "(problem for GCHP)"
- Check that dimension names have lowercase letters
- Check that time:units does not have decimals
- Check that there are 72 level centers/73 level edges (for GCHP)
- Change "lev:positive" from an option to a requirement
- Make sure that variables have dimensions in the proper order
- Removed commented-out unused code
- Add an ending separator line
- Update comments
- Trim trailing whitespace

Signed-off-by: Bob Yantosca <[email protected]>

scripts/nc_chunk.pl
- Renamed the temporary file (used in the nccopy command to chunk the
  file) from "tmp.nc" to "tmp.$ncFile".  This will put "tmp." in front
  of whatever the input file name is called.
- This resolves an issue where "tmp.nc" could not be chunked because
  the temporary filename was also called tmp.nc.

Signed-off-by: Bob Yantosca <[email protected]>

Added info about the modifications to isCoards and nc_chunk.pl

Signed-off-by: Bob Yantosca <[email protected]>

scripts/isCoards
- Changed matching criteria "m/./" to "m/\./" where we check
  time:units for decimal points.  This had been returning false positives.

CHANGELOG.md
- Updated accordingly

scripts/isCoards
- Routine &analyzeResults returns the # of lines of the @bad array
  as the status, or 0 if no errors are found.
- Use a "never-nest" style in routine "main", to move the error check
  to the top of the routine and avoid the else block
- Consolidate the main() and exit($?) statements

Signed-off-by: Bob Yantosca <[email protected]>