LBF plugin and layout updates
Option for showing description instead of codes in LBF Billing Code fields, and some related fixes.
Added features to support data sharing among LBF forms.
Cosmetic tweaks for column widths in the layout editor.
Updates to support a "VisForm" source in LBF layouts.
Layout options for read-only fields, and auto-display age or gestational age after dates.
Add P option for LBF layouts to default to previous value. Fixed data save bug.
Support for LBF field skipping feature.
LBF: Report fields from other sources, save form even if no native fields, some other fixes.
Initial Commit

Wrote element exception for Florida Blue and added element BPR04 to
gen837.
Added BPR04 to parse 835, and added exception for adjustment code 144 to
prevent negative payments "incentive adjustment" which causes great pain
to correct for those companies like Cenpatigo that use it.