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using gsed on Solaris

See merge request COBOLworx/cbl-gdb!5

- "cbreak PROG section end-of-prog" Was already available in as: cbreak section MODULE:SECTION. Adjust the help text
- implemented if in cbreak statement
- fixe typos in numeric and regexp break
- cbreak and cwatch are "not repeated" anymore
- removed some blank lines in help text
- pep8 changes

-fsource-location placed a trace_stment() call before the start of the generated
C for every COBOL instruction.  This was needed to make the .loc assembly directives
work.  Simon replaced those calls with "call cob_nop()".  I get rid of them, except
when the following .loc statement has "discriminator" in it.  Otherwise the code
doesn't trap properly through some loops.  I have no idea why.

This is the last commit with the -fsource-location switch enabled.

Update cobcd.py help

See merge request !2