LP#1708291: improvements to egEditFmRecord

LP#1708291: improvements to egEditFmRecord

egEditFmRecord now knows how to specify that a custom Angular template
be used to supply the input widget for a given field; the initial use
of this will be allowing the prediction pattern template editor to be
used to set the pattern in a pattern template. The customFieldTemplates
attribute is used for this purpose.

This patch also teaches egEditFmRecord when to allow an org unit
selector to default to the workstation OU. The orgDefaultAllowed
attribute is used for this purpose.

Finally, a fixes a bug that ensures that the Save button is active
only when the entire form is valid.

Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>