Small modifications. Required for cb-welcome

Line wrap was changed from 71 characters to 76. This is required to keep the visual look of cb-welcome after modifications.
Maybe we should stick to some different number? 76 looks so random :)

In addition to that lines like
if [[ -x /usr/bin/someprogram ]]; then
were changed to
if type 'someprogram' &> /dev/null; then
Because in some cases programs can be located somewhere else.