CSS Layout and Other Cleanups in the Manager Applications

[Jacopo Cappellato]

Following the great advices in 
https://issues.apache.org/jira/browse/OFBIZ-241 I've started to play 
with the styles in maincss.css file and apply the mods to the 
manufacturing application.

I've noticed some minor side effects (for example the texts in the main 
webtools page are smaller now) and I wanted to be sure that the work I'm 
doing is correct and, most of all, if it is a good moment to do this 
work now (i.e. before a release).
So please, have a look at the revisions 492187, 492201, 492242 
(especially at the changes I did to the maincss.css file) and let me 
know what you think.

Jacopo