always check that the base sql has been imported.
async db building
After this merge, we could move install.php to the end of the install documentation. Makes a more natural flow.
* Add support for custom MySQL unix-socket
* NULL must be lowercase!
* Naive edit of html/install.php
* fixup
* Refactor dbConnect
Use it everywhere
* $config needs to be global
Don't need to set $database_link
* small cleanups
* initial work to standardise collation
* more updates
* final bits for collation update (famous last words)
* Rename 165.sql to 166.sql
* Update schema version inside 166.sql
* moved schema file 166->171
* feature: allow validate.php to be run from any working directory
* remove redundant realpath() call
* re-add realpath() to remove symbolic links
* realpath() isn't needed...
* chdir() in all php scripts in ./ and ./scripts/
* update-sql.php clearly is not used, as it was broken.
* Change some scripts to executable
Remove extra chdir() call in snmp-scan.php
* Missed console-ui.php
Kind of fixed console-ui.php help output
* Re-add newline
