Modifications to RecADCOnly form, requested by D. Galtieri.

1) Minimum scope window width decreased from 1s to 0.05s.
2) "A/D Signals Only" is now checked by default.
3) Stimuli protocol lists can now be edited, with the ComboBoxes updating
   accordingly, without closing and reopening Record Signals window.
Revert change of "A/D Signals Only" in Record Signals window clicked by default

Change was made because of suggestion that photostimulus workflow would
be improved without having to select this each time.  But others reported
that this was detrimental to linescan workflow, in which case user would
need to keep unchecking this box.  Box is now unchecked by default as it
was originally, but retains state between closing and reopening Record
Signals window.
Fix failure to commit RecADCOnlyUnit.dfm

When I made the recadc_interface branch, and specifically the change
to make the "Record AD Signals Only" checkbox persistent, I forgot
to commit the .dfm file.  (Since I subsequently never bothered moving
that file back from the repo to the WinFluor workstation, this error
was not noticed until now, following the upgrade to 3.4.5.)
Merge pull request #8 from darrincedwards/recadc_interface

Modifications to RecADCOnly form, requested by D. Galtieri.