mrb_inspect() also calls mrb_obj_as_string() after #inspect to ensure
the mrb_value is a string.

Remove the unused libterminfo detection code.

The detection code is unused even on OpenBSD 5.7,
because of the standard installation is libtermcap be installed, not libterminfo.

This fixes #2829

Tested on Arch Linux (x86_64) & OpenBSD 5.7 (amd64).
Signed-off-by: Huei-Horng Yo <hiroshi@ghostsinthelab.org>

Detect if ncurses' backend is terminfo or termcap.

Borrowed from @mattn's code at:
https://github.com/mruby/mruby/issues/2662#issuecomment-65535705Signed-off-by: Huei-Horng Yo <hiroshi@ghostsinthelab.org>

gsub/sub supports back references in substitutes.  fixes #2816.

This implementation is compatible with CRuby's String#gsub/sub
except \1 ... \9 and \+.  They are useless without Regexp library.

Fix build on MIPS of linux

Added some documentation for some of the functions found in array.h.

MIPS of Linux platform is supported frexpl(3).
This fixes to use the frexpl that are provided with gcc if user wants to build
on MIPS of Linux platform.
Signe-doff-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

remove unnecessary mrb_immediate_p()

directly call ary_new_capa()

push only after OP_GETCONST in VAL mode

`!mrb_array_p(ary2)` and `mrb_type(obj) != MRB_TT_DATA` are  sufficient.

Compiler codes is moved to "mruby-compiler".
Executable `mrbc` is moved to "mruby-bin-mrbc".

only generate gets of non-local vars in VAL mode

fix two potential cases of signed integer overflow

Added more documentation for some of the functions found in mruby.h and value.h

This fixes a crash for code like "#{@a;1}".

Unlike CRuby globals are excluded too since mruby doesn't implement
hooking.

Wrote documentation for functions found in the value.h file.