Screen and vim updates for better compatibility

screenrc

@@ -1,3 +1,11 @@
+# Enable 256-color support inside Screen
+term screen-256color
+attrcolor b ".I"
+termcapinfo xterm 'Co#256:AB=\E[48;5;%dm:AF=\E[38;5;%dm'
+defbce on
+altscreen on
+set term=screen-256color
+
 # Remap Ctrl+A to Ctrl+B
 escape ^Bb
  
@@ -12,22 +20,14 @@ defscrollback 10000
 # no welcome message
 startup_message off
  
-# 256 colors
-attrcolor b ".I"
-termcapinfo xterm 'Co#256:AB=\E[48;5;%dm:AF=\E[38;5;%dm'
-defbce on
-
 # Gray color for region borders 
 caption string "%{03} "
  
 # Get rid of vertical region borders
 rendition so "="
 
-# mouse tracking allows to switch region focus by clicking
-mousetrack on
-
 # default windows
-screen -t Shell1  1 bash
+screen -t sh  1 bash
 select 0
 bind c screen 1 # window numbering starts at 1 not 0
 bind 0 select 10

vimrc

@@ -1,2 +1,25 @@
-set termguicolors
+" Set desired colorscheme.
 colorscheme desert
+
+" Optional: set 256 color mode
+"set termguicolors
+
+" Turn on code syntax highlighting.
+syntax on
+syntax enable
+
+" Show number lines.
+set number
+
+" Tab key uses 4 spaces.
+set tabstop=4
+
+" Tab shift with << and >> shows 4 spaces.
+set shiftwidth=4
+
+" Automatically indent after new lines.
+set autoindent
+
+" Show symbols to indicate tab whitespace.
+set list
+set listchars=tab:\:.