Updated appendToTag function

[gcallanan]

When using the foreach statement to generate actions, each actionTag now has the action number appended to the tag instead of creating a whole new tag.

For example
'''
foreach uint i in 0..1 generate
actionTag: action In[i]:[token] ==> Out[i]:[token + i] end
end
'''

Now becomes:
'''
actionTag._0: action In[0]:[token] ==> Out[0]:[token + 0] end
actionTag._1: action In[1]:[token] ==> Out[1]:[token + 1] end
'''

previously it became:
'''
actionTag_0: action In[0]:[token] ==> Out[0]:[token + 0] end // No longer works this way
actionTag_1: action In[1]:[token] ==> Out[1]:[token + 1] end // No longer works this way
'''