Tweaked and extended PHPDoc coverage in scbAdminPage.
Got rid of extract() in scbAdminPage methods.
Adjusted scbAdminPage->submit_button() PHPDoc to reflect accepting array as first argument.
Improved formatting of extended PHPDoc description for scbAdminForm->form_wrap()
Merge pull request #22 from Rarst/adminpage-tweaks

scbAdminPage tweaks