Improve Searching for Collector Numbers (add flexibility to the search)

[fbungartz]

Many Collectors frequently have their own system of numbering specimens. Philippe Clerc for example uses the year plus a sequence number, e.g., '97/-93' stands for specimen number 93 collected in 1997. There are quite a few collectors that use dates or letters as part of their collection numbers.
But entering parts of these unusual collector numbers doesn't work. Wild cards also don't work in this number field (which is actually a text field, but frequently contains numbers). This is not trivial, because it means partial searcher and any slightly more complicated number cannot be found.
For example neither '97/' nor '97/%' returns any specimen collected by Philippe Clerc; the only way to find a specimen with that number (and not all that contain the '97/') is by entering an exact match.

[themerekat]

This issue previously logged here! #743