Change nogroup to nobody

Arch doesn't have nogroup by default.

Applied DPMS patch

This patch interacts with the Display Power Management Signaling and
automatically turns off the monitor after a configurable time. The
monitor is reactivated by a keystroke or moving the mouse.

Add personal configuration and gitignore

bump version to 1.5

Makefile: explicit_bzero.c was copied twice (GNU make gives a warning)

Properly clear the last entered character

When enter is pressed, passwd[len] will be set to '\0'. Pressing
backspace is supposed to remove the last entered character.

But currently, the clearing has an off-by-one, as in setting
passwd[len] to '\0' just like enter would do.

You can also verify it by imagining len=1 and that it's impossible to
clear passwd[0] by pressing backspace with the current code.

Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>

rm trailing whitespace in README

syntax fix

there can only be one window in the event

Fix resize with multiple monitors and portrait mode

When connecting/disconnecting a portrait monitor, the
XRRScreenChangeNotifyEvent height & width are reversed due to the XRandR
rotation; detect this and DTRT.

bump version

add arg.h and util.h to Makefile

clarify colors in config.def.h

move config.h inclusion after type declarations

Unboolify slock.c

Use explicit strcmp() instead of inlining it

Makes it a tad more readable; the previous "optimization" will be done
by the compiler anyway.

No need for oldc to be static

Use NUL character constant explicitly

Keep the line-lengths at bay

This makes the code more readable and prevents wraparounds in the
editor.

Add a section on security considerations

The section on security considerations sheds some light on the problems that we
can't solve within slock but which the user has to solve in his X configuration.