[dw-free] /admin/pay should allow the addition of paid time in arbitrary increments

[fu]

[commit: http://hg.dwscoalition.org/dw-free/rev/4c40adbf5220]

http://bugs.dwscoalition.org/show_bug.cgi?id=2040

Allow site admins to add paid time in more granular increments, increase
month limit, and manually edit the expiration date.

Patch by catness.

Files modified:

• cgi-bin/DW/Pay.pm
• htdocs/admin/pay/index.bml

( Diff: 2 files changed. )