Added special version of STRING-LEFT-TRIM for general vector bag and general string.
Added special version of STRING-LEFT-TRIM for general vector bag and general string.

vtomole/SICL,vtomole/SICL,clasp-developers/SICL,clasp-developers/SICL,clasp-developers/SICL,clasp-developers/SICL,vtomole/SICL,vtomole/SICL