Merge pull request #154 in CASA/casa6 from CAS-12958 to master
* commit 'a574cfaddec2c10fbb274a7f3b8332744c90f052':
Modify flags
Add extract_symbols script
Restore optimization flag
Fix help message
Add debug flag to Fortran
First stab at relwithdebinfo
Merge pull request #157 in CASA/casa6 from CAS-12850 to master
* commit 'ae80f80144e8f0134b4ace114e3187aa0a4035a8':
Fixed an issue when convsize can be a multiple of a very large prime number