Chiral Flag Error

• Checker searches for incorrectly set chiral flags: "Absolute" flag can only be set when all chirality information is specified for the given molecule.

• Fixer offers removing the chiral flag (removeinvalidchiralflag).

  Example :

  Chiral Flag Error Checker (chiralflagerror)	Warning:	Fix
  		Fix Chiral Flag (removeinvalidchiralflag)
  Detect invalid chiral flag	ex_chiralflag_ch	ex_chiralflag_f