[common][bash][vim] 1. debian_chroot/color_prompt. 2. bash history. 3. vim modeline.

restore below bash variables processing in .bashrc
1. [bash] debian_chroot
2. [bash] color_prompt

extend bash command history; restrict vim modeline to prevent from
unnecessary warning.
1. [bash] command history
2. [vim]  restrict modeline in first or last 2 lines