Currently has a file handle leak (and will eventually run out of handles) related to the self update process.
Either need to fix that or rip out self-update and leave that up to cron or something.
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* 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
