main/install: Add MAMP redirect fixes

Same bug as commit f8664e8fa81114ab69e19e386a0906eb1a66bfe9.
question.class.php: Update for DB changes

The columns affected by the query were not explicit, so it was breaking
on insert because of parameters mismatch.
Merge pull request #93 from diegoe/minor-fixes

Two minor fixes: MAMP documentation and missing fields in question.class SQL query
Minor - English language fix
Updated admin index to use api_get_multiple_access_url() wrapper instead of direct access to setting
Added comment about config files
Fixed multiple access URL detector function
Fix require path in access url scripts
Added comment about root_url to enable multiple urls
Using last resort  to avoid missing URL definition
Fixed big issue with multiple URLs, preventing the selection of the corresponding settings
Added ID to results of api_get_access_url() to avoid unnecessary array merges
Added messages.tpl to jquery template
Added login.tpl to jquery template