Fix LSF command handling bugs and clean up dead code

[krokicki]

Misc improvements:

• Fix poll() to parse partial bjobs output when some job IDs have been cleaned from LSF history, instead of skipping the entire poll cycle
• Map LSF suspended states (USUSP, SSUSP) to RUNNING instead of PENDING to prevent status regression for jobs that were already executing
• Fix cancel_all to tolerate individual cancellation failures instead of abandoning the operation
• Remove dead .out/.err replacement code from array job script rewriting
• Unify _BJOBS_FIELDS and _BJOBS_RECONNECT_FIELDS into a single constant that includes job_name

@StephanPreibisch