Clean up and regularize alloctypes

[Kris Deugau]

Current preseeded alloctypes have a few internal contradictions that prevent certain future high-flexibility options from working correctly. Need to comb the preseeded types and clear up these irregularities as well as lay out underlying logic to support an interface for adding new custom ones (see #18).

[Kris Deugau]

(In [416]) /trunk

Update mailNotify to use new table notify to decide who to spam
with notices on various events. See #2.

• existing notification calls updated. Still need to move calls into IPDB.pm's subs
• IPDB.pm and MyIPDB.pm updated with new semiglobal vars for org name, SMTP host, domain. Will add others as needed so MyIPDB.pm can be moved to /etc/ipdb/ (see #17).

Internal allocation types will need to be rearranged somewhat to
make full use of the flexibility possible. See #20.