Do not set changeps1 to false as that affects deactivation of PS1 on bash

This MR includes the following fixes:

• Do not set changeps1 to false as that affects deactivation of PS1 in hybrid environments (closes #16 (closed))
• Remove unused channels from default environment
• Use the name condarc for the rc-file created at the root of each new environment with create (more visible)

enabled an automatic merge when the pipeline for c2cb0adb succeeds

merged

mentioned in commit fc5e0c07