(fixes issue #4277)
* The sha256sum error message now displays the invalid
destination checksum if it doesn't match the one that
is specified in the arguments. This is useful for
debugging purposes.
* Non-alphanumeric characters, including the infamous
Unicode zero-width space, are removed from the sha256sum
argument prior to the check.
Migrated all examples: in DOCUMENTATION=''' string to standalone EXAMPLES=''' string
Added deprecation warning to moduledev.rst and remove deprecated example from it
Fixed up a few typos and uppercased some acronyms.
add consistency to how EXAMPLES are formatted