Add function signature completion for all functions

[psynaptic]

Akin to Steven Witten's generate.php which parses all PHP files within a specified Drupal installation and generates snippets for tab-triggerable function signatures, I'd like to use API module's secret function dump data to do the same thing.

Example: typing variable_get and pressing tab would print variable_get($name, $default = NULL) where $name and $default = NULL would be tab-able placeholders.