Refactor .bashrc; add .bashrc.d drop-in files

.profile

@@ -1,7 +1,5 @@
-#!/bin/sh
-
 #
-# ~/.profile (includes ~/.profile.local)
+# ~/.profile -- Included by .bash_profile; includes ~/.profile.local
 #
 
 # SSH key agent is started by systemd user
@@ -11,6 +9,7 @@
 export GPG_TTY=$(tty)
 
 # Environment variables
+export TERM=xterm-color
 export TERMINAL=mate-terminal
 export EDITOR=vim
 export BROWSER=firefox
@@ -25,4 +24,3 @@ export WINEDLLOVERRIDES=winemenubuilder.exe=d
 
 # Include host-specific .profile
 [ -f ~/.profile.local ] && source ~/.profile.local
-