- update to 0.52.23:
* fix automatic height of menu/list in whiptail (broken in 0.52.22)
* fix automatic width of whiptail --yesno box
* fix automatic width in whiptail with unicode characters
* fix automatic width with whiptail --noitem and --notags options
* fix spacing with longer tags in whiptail
* avoid overlapping backtitle in whiptail with automatic height
* fix crash in whiptail with new libpopt
* switch from usleep to nanosleep (Rosen Penev)
* fix libnewt.pc to enable static linking (Alexey Sheplyakov)
* fix LDFLAGS order in snack linking (Sam James)
* use CFLAGS when compiling snack
* improve configure.ac (Thomas Kuehne)
* install header and libnewt.pc with shared library (Michael Olbrich)