Plane settings should overwrite current setting

+ let redraw() handle corrupt w:txbi
Center on resize only 1 way
scrollwheel for pager
make autolbl relative to current line
doc about nonlabel t text on label line
Doc subtleties of autolbl pos
enable scrollwheel for xterm*, sgr

+ handle scrollwheel in map
(finally) doc specific reason for sgr, xterm2
oops -- referencing wrong map!!!
CONF (conflict) log if > 2 autolabels per cell
Changed log error names
All drag horiz split in sgr, xterm2
simplify write to file
Doc log messages
Update README.md
oops.. make sure column exists before filtering it
Actually apply zoom settings
Don't check for equality, only for 'A'
(refact) move some functions around
Merge branch '1.7.6' of https://github.com/q335r49/textabyss into 1.7.6