NAME: keep_compatibility PURPOSE: 1) define key_forgetold = 1b - keyword_set(flag) 2) remove all oldcm_used.pro found in !path 3) define and create myuniquetmpdir and add it to !path 4) copy oldcm_full(_empty) to myuniquetmpdir+'oldcm_used.pro' CATEGORY: compatibility with old version CALLING SEQUENCE:keep_compatibility [, flag] INPUTS: flag: 1 or 0 to keep or forget the compatibility dir: the directory where we create oldcm_used.pro. if omitted, is automatically defined to 1b - keyword_set(key_forgetold) COMMON BLOCKS: cm_general SIDE EFFECTS: see purpose RESTRICTIONS: copy oldcm_full or oldcm_empty must be found in the !path. dir must aslo be in the !path