class library: using standard prefix for synthdefs

It is good practise to prefix synthdef names that are generated by the class system itself with "system_". This modifies the synthdefs in the FreqScope class.
class library: allow recursive node proxy definitions
class library: fix typography in jitlib
class library: node proxy set is now uniform with setn
class library: implementation of array.move by Glen Fraser
help: array.move
class library: allow functions to be inputs of Out UGens.

All UGens should be able to take functions as arguments. For this, convert inputs to ugen before replacing zeroes.
class library: linking a document to an envir uses its saved envir, avoiding the envir stack
class library: when nesting node proxy definitions, protect from user error