[RAevol7] Fix a read unitialized value within the RAevol part of the code....

[RAevol7] Fix a read unitialized value within the RAevol part of the code. WARNINGS: This fix is critical for Aevol too (read comment).
The maximum number of codon within a protein is fixed to 3*64. But it was only 64 in Aevol 7. The maximum number is now 3*64.
Moreover, if this barrier is reached, a log error message is generated.