Psqlrc and pager setting for Postgresql

```
-R = escape sequences are interpreted.
-i = ignore case in searches but only if all lowercase
-M = more verbose
-S = chop long lines
-x2= tabstobs size in spaces
-X=  Disables sending the termcap initialization and deinitialization  strings  to  the  terminal.
        This  is  sometimes desirable if the deinitialization string does something unnecessary, like clearing the screen.
-F= quit if one screen
```