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-Cleaning TODO.
-Taken from Blas' v1.5 checklist and revised for v2 by Claudio and for v3 by Popa Adrian.
-
-The order is not significant.
-
-Macros
-M1.- Remove NOT_USED_OR_REPLACED Macro
-Pending.
-
-M2.- Remove BOOLEAN, TRUE and FALSE macros and replace with keywords.
-Done where except some places where it doesn't make sense to remove them.
-
-M4.- Remove TEXT and SCHAR macros.
-Tricky and in some places SCHAR is really used as signed char.
-
-Code
-C1.- Remove clang++ warnings (excluding parentheses, unused var, non complete switches and pragmas)
-Pending.
-
-C2.- Define (type-safe?) unions for nod_arg and lls_object. 
-	Nod_arg is used in several places of the code to contain pointers to several kinds of objects or numbers, whether is defined as pointer to xxx_nod.
-	The same happends with lls_object in lls (linked list) where the lls_object can store pointers or numbers, whether is defined as pointer to xxx_nod.
-	See gpre.h nod_arg in gpre_nod struct and lls_object in lls struct.
-Another solution exists.
-
-C3.- Remove casts.
-Partially done.
-
-C4.- Replace macros with code with inline functions.
-Partially done.
-
-Builds
-B1.- Posix take cpp generated from epp out of src directory.
-Unknown state.
-
-