Fixed the Update Weight Modal

Changed the update weight modal to actually set the weight value instead
of the AccountWeight object. Also fixed the placeholder value. Moved the
createOrUpdateWeight method from the AccountSetupController to the
AccountController.
Undid Changes for index.xhtml

Removed the changes where I changed the ajax call on the username field
to use @this and @form. It actually broke the tab functionality since
the entire form would be re-rendered on tab.. Woops.
A Lot of Work On Account Initialization Again

Changed the whole height crap. There is now a height value for inches,
feet, and centimeters. Hen switching unit systems, these values will
change. Neat stuff. Also updated the weight values on unit system
change. The next thing to do is set default weight, and change the
defaults of height/weight for women.