fix dzen2/monitor display matching for latest xrandr

update regex patterns used to match displays for xrandr 1.4.0
set clipboard=unnamed

appending unnamed doesn't have the desired affect (yy doesn't copy to
selection register)
avoid system calls in TabLine to prevent wierd vim quirks
replace :bd w/ version that won't close the current tab on last buffer
updated a,i,y,p mappings for pairing w/ virtualedit mode