Disable % field when not modificable

[mercurialuser]

Hi,
there are some constraints that must have the % field set to 100. Unfortunately the field is editable and it causes confusion, expecially for newcomers.

I suggest to keep the field on screen but just disable it, make it not editable...

[mercurialuser]

Sorry, I already asked months ago.. it's in the TODO... but an user told me yesterday and I didn't check the TODO....

sorry

[Liviu Lalescu]

Not a problem

I added also your second words, as a rewording.