extend Evoke Gerund #42

I'd like to propose the extension for the Evoke Gerund (`:) conjunction, described on page Extended forks. Following is example of such extension usage, e.g. for 3-fork ("9" is selected randomly for example only):

   NB. proposed evoke by extended Evoke Gerund (`:) functionality
   2 (+`%:`-`%`^`*`:9) 4
0.00379719j0.00219231

   NB. evoke using the model adverb from script supplied with page 'Extended forks'
   2 (+`%:`-`%`^`* fork3) 4
0.00379719j0.00219231

In gerund, Cap ([:) (at leftmost position in execution tree) and Self-Reference ($:) verbs support is desirable.

-- Igor Zhuravlov <2009-12-26T19:30:00Z>