Transparent Background

General

wavemon now has a transparent background - thanks to @bigfreak85 in #61.
This option be disabled via transparent_bg = off in ~/.wavemonrc.

Fixes

• Info Screen:
  • disable locale to avoid funny thousand separators (#50),
  • prefer station signal over average station signal (#47);
• Scan Screen:
  • fix bug in displaying TLV elements (thanks to @chunmeng in #56),
  • restore interface state on exit (#46);
• Build:
  • allow configure --without-libcap (used by OpenWrt, #54).

Miscellaneous

• more fixes for reproducible builds - time/date display is gone (#48, #59);
• various code updates (new nl80211.h) and clean-ups.