Make number of items in form and panel draft lists configurable

[vakopian]

Currently the number of items in the datagrids in the form and panel drafts are hard-coded to 20 and 8. The attached patch makes them configurable through the configuration.inc.php

[alex94040]

I really hate that we keep expanding the configuration file to add more and more options. These options are valuable, but they are far from critically important. What do you think about splitting out "most important" config - and optional config - as two separate files?

[vakopian]

I don't mind that. We could also just put these unimportant options at the bottom, after a big block of comments, just to avoid the decision of which config file each setting should go, plus the (small) overhead of including two files instead of one. Pick whichever way you prefer.

[alex94040]

Fair argument - we can just keep the unimportant stuff at bottom. I don't feel that this is critical enough to argue about :) Go ahead and apply the patch! Thanks for doing this.

[vakopian]

(In [1386]) reviewed by alex. Fixes #767