web: add optional "extra" arg to form_start, e.g. to allow file upload
web: change form div spacing to be 3+9 rather 4+8
(could make this a parameter)
web: add form_focus() to initialize focus on a field
web: add optional nrows arg to form_input_textarea()
- add KW_CANADA keyword for WCG
- use https: for BOINC URL