Cobra compiler options read from file

[hopscc]

It would be convenient for large projects and setting common options once in one place if the cobra compiler would read options from a file but allow them (if duplicated) to be overridden with commandline entries.

[hopscc]

Patch file including code changes, tests, rel note and 2 sample options file,
one for a template (.cobrarc) showing all options with description all commented out, and other providing options settings for building the compiler itself (cobra.cobrarc).

patch makes compiler by default look for first of 3 files in cwd - .cobrarc, cobra.rc and cobra.init. Options are read from first file found (option:value pairs) and merged into options record, optionfile entries are overridden by same named command line entries .
Added New commandline option (-options-file/optfile/of) allowing suppression of this behaviour ( -options-file:none) or specify an alternative filename to use rather than the default search ( -options-file:FILENAME)

[Chuck]

Bump.