Alternative to colordiff is using grc
Updated comments regarding aliases
Alias term-title for setting terminal title
Alias for screen when TERM value is too long

When TERM environment variable had value "rxvt-unicode-256color" screen
reported: "$TERM too long - sorry." This only occurred only in Cygwin.
Introducing .bash_interactive script

Declarations of EDITOR, VISUAL, BROWSER and PAGER were moved from
.bash_noninteractive to .bash_interactive.

Script .bash_interactive handles also setting up prompt, history and
shell options.
Handling of {http,https,ftp,all}_proxy env variables

User may declare array for each proxy type and one is randomly selected
from it to set appropriate environment variable.