Add table to documentation of module functions

[jjg-123]

Since some people do not use the workspace ever, their only source of information is, apparently, the reference manual. Add an appendix (?) of functions per module. Basically just run (e.g. for strings)

)funcs system -fq -r ^string.* -cols
string#contains([2,3])
string#detokenize([2,3])
string#differ_at([2])
string#from_uri([1])
string#head([2,3])
string#index_of([2,3])
string#insert([3])
string#replace([2,3,4])
string#substring([1,2,3,4])
string#tail([2,3])
string#to_lower([1])
string#to_upper([1])
string#to_uri([1,2])
string#tokenize([2,3])
string#trim([1])
15 total functions

and put the results, sans qualification, in a table with a one-line description.

[jjg-123]

Even better, put it in the function reference. Have a section listing functions by module.