TRQ-1797: print error to stderr in qsub
TRQ-2509: Properly handle basic shell syntax in qsub script

- properly (as shell does) handle quotations in qsub script #PBS
  arguments in make_argv()
- fixed wrong static buffer operations in do_dir()
- fixed and re-enabled qsub_functions() unit tests
- wrote make_argv() unit test
src/cmds/qstat.c
TRQ-2025: fix prints queue name twice

- implement fix in get_err_msg
- unit tests:
Merge pull request #256 from DSRCompany/TRQ-2509_wrong_qsub_script_quotation_parse

TRQ-2509: Properly handle basic shell syntax in qsub script
Merge pull request #257 from DSRCompany/TRQ-2025_prints_queue_name_twice

TRQ-2025 prints queue name twice
Merge pull request #255 from DSRCompany/TRQ-1797_qsub_prints_error_to_stdout

TRQ-1797: print error to stderr in qsub