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