Make RecADCOnly window open a new IDR file automatically if one is not open.

Feature request from Michelle Day, to improve workflow (by not having
to click on "New File" at the beginning of each recording run).
Merge branch 'master' into recadc_openfile
Merge branch 'master' into recadc_openfile

Conflicts:
	RecADCOnlyUnit.pas
Resolution:
        Just comments, both sets kept.
Merge branch 'recadc_openfile' of https://github.com/darrincedwards/WinFluorNW into darrincedwards-recadc_openfile

Conflicts:
	RecADCOnlyUnit.pas
Make RecADCOnly window open a new IDR file automatically if one is not open (from Darrin Edwards)