Remove obsolete modules.

They reference tools under GMT::Maq, which no longer exists.
Use existing variable rather than calling non-existent subroutine.
Merge pull request #158 from tmooney/fix_bamqc_event

Bugfix for BamQC Event
Merge pull request #150 from tmooney/remove_maq_references

Remove obsolete modules that reference GMT::Maq commands.