ctype: tests and reorganize

Wrote tests for the functions implemented in 40558b26 and maybe made that
test a little more comprehensible.

Also made sure that fmt.sh and test.sh were being executed by bash all
the time (compatibility with other shells).

Finish ctype impls

Create crate and stubs for wctype

Create the wctype crate and stub functions with the unimplemented macro.

Add ctype functions and atoi/atol

Add ctype functions
  - isalnum
  - isalpha
  - isascii
  - isdigit
  - islower
  - isspace
  - isupper
Add stdlib functions
  - atoi
  - atol
Fix some warnings
Make a fmt run

add test for errno

Implement several more string functions and add errno