Alias of xschem is causing trouble

[hpretl]

Currently, xschem is aliased to xschem --rcfile $PDKPATH/libs.tech/xschem/xschemrc.

This causes issues in various scenarios, like using a local xschemrc or trying to pass an additional --rcfile when starting xschem.

The idea behind this alias is to provide the PDK xschemrc to xschem, especially for less experienced users.

Better solution than using the alias is this: Put into /headless/.xschem an xschemrc with this content:

# Source the PDK xschemrc file
source $env(PDK_ROOT)/$env(PDK)/libs.tech/xschem/xschemrc

This will still load the PDK's xschemrc if no other xschemrc is provided, but it does not require the alias.

[hpretl]

Implemented with da3018b.

And while looking into this, I figured it is pretty much the same situation with magic, so I applied the same story there as well. The equivalent config file is /headless/.magicrc, it does the same as detailed above. Implemented with ba1cadc.