[pgAdmin][RM4873] Change comment of a procedure with arguments

Hi Hackers,

Attached is a patch to fix following issues:
1) Change comment of procedure with arguments as a procedure can be
overloaded. Note that on EPAS servers, procedure overloading works only for
v11+ .
2) The save button of a procedure dialog is enabled without any change.
Fixed.
3) Fixed formatting of the reverse engineered SQL.
4) On EPAS servers, parameters set were not displayed in the SQL generated.
They are visible only if set to edbsql. Fixed.
5) Changing the volatility option of any existing procedure was not
working. Fixed.
6) Changing the parallel option (EPAS v9.6+) was not working. Fixed.
7) Added RE-SQL test cases for procedures. Fixes #4620.

Please review.

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Thanks and Regards,
Aditya Toshniwal
pgAdmin Hacker | Sr. Software Engineer | EnterpriseDB India | Pune
"Don't Complain about Heat, Plant a TREE"