Added an option -ldi<N> to control indentation of local variable names.

Added an option -ldi<N> to control indentation of local variable names.
The default is to be backwards compatible and non-KNF (use the same
indentation for locals as for globals; -ldi0 gives KNF indentation
for locals (none)).  The indentation for globals also applies to struct
member names in local declatations.  The indentation of variable names
in multi-line declarations is broken in various ways and this commit
gives some new variations.

indent.1:
Also clarified the description of -di<N>.