properly combobulate debian packaging scripts

Slice RPATH out of body politic with more extreme prejudice.

Patch usr/share/polkit-1/actions/org.pkexec.ettercap.policy in-place
within debian/rules with sed, thanks to Gianfranco Costamagna.
log changes
add soname to libettercap
guard #define CTRL(x)
typos in comments and user-interface strings
Address gcc -Wall warning

/home/barak/src/git/debian-src/ettercap/include/ef_functions.h:28:19: note: expected ‘char *’ but argument is of type ‘const char *’
 EF_API_EXTERN int yyerror(char *);

warnings: "%lld" passed u_int64.
Merge branch 'tweaks-to-upstream'
dynamic link is to libettercap.so.0 not libettercap.so

Install libettercap.so.*, targets of libettercap.so

Add debian/shlibs.local for libettercap.so.0
Updated build-deps
update lintian overrides
tweak dependency order
libltdl3-dev replaced by libtldl-dev, adjust build dependencies accordingly
luajit-5.1-dev replaced by libluajit-5.1-dev; adjust build dependency
note that INSTALL_EXEDIR doesn't work in 0.8.0
move two-line script ettercap-pkexec from ettercap-graphical to ettercap-common
trim trailing whitespace
log changes
install in /usr/bin/ettercap not /usr/sbin/ for non-root log analysis
disable LUA support
log changes