Reads a memo from category submode and stores it into the stringarray array. The memo is addressed by its name (first line of memo). The name consists of an signature sig (for example "! " for OWBasic programs) and a name. Use an empty signature, if you dont want to use this feature. Leading or trailing spaces of the name of the memo are ignored.
The number of really available lines is stored in LNR. If given, fp is set to the filepointer of that memo. This allows e.g. to overwrite the memo after changes are done.