* libguile/procprop.h (scm_sym_arity): Deprecate. I didn't move it to
deprecated.h though, because that might have some boot implications --
though I didn't check.
* libguile/procprop.c (scm_procedure_properties)
(scm_set_procedure_properties_x, scm_procedure_property)
(scm_set_procedure_property_x): Deprecate access to a procedure's
arity via procedure-properties. Users should use
procedure-minimum-arity.
* module/ice-9/channel.scm (eval):
* module/ice-9/session.scm (arity):
* module/language/tree-il/analyze.scm (validate-arity): Fix up instances
of (procedure-property x 'arity) to use procedure-minimum-arity.
* module/ice-9/channel.scm (eval): Fix number of arguments to
`guile:eval'.
* module/oop/goops/save.scm (write-readably): Fix number of arguments to
`write-array'.
* module/srfi/srfi-19.scm (priv:char->int): Fix number of arguments to
`priv:time-error'.
Moved ice-9/ and oop/ under module/, with the idea being that we have
only scheme under module/. Adjusted configure.in and Makefile.am
appropriately. Put oop/ at the end of the compilation order.
