Add /etc/passwd support

Fix slock to work with /etc/passwd without /etc/shadow.
while we're at it, remove an occurence of trailing whitespace.

Set errno to 0 before getpwuid() and check it afterwards

applied Robert Schneider's Linux suggestions, also bumped version and updated LICENSE file's copyright notice

prepared 1.1

applied andres' multi-slock fix, thanks for spotting this issue

added Ben's password placeholder entry kludge

applied Eckehard Bern's dualcolor patch to slock

Added tag 1.0 for changeset 05b949016e85

preparing 1.0

select for SubstructureRedirectMask as well

fixed missing new lines

typo fix

added XRaiseWindow workaround when new clients are launched

applied Michaels patch

added dummy error handler to prevent X from terminating slock just in case

applied Markus' patch to die in case /etc/passwd is unavailable

applied Fernando Silveira's multiscreen patch for old style multihead setups

applied Ali Gholami Rudi's patch regarding DPMS timeout customization and persistence

Added tag 0.9 for changeset 1e8a77601cb9

fix