gEDA: Gschem modification proposal

[Wojciech Kazubski <wk-at-NOSPAMire_dot_pw_dot_edu_dot_pl>]

Hi Ales and All!

I have two proposals for changes in gschem:

1) Treat the text having name and "=" sign but no value as a legitimate 
attribute. This will allow to make an empty attribute as "footprint=", that 
will appear after editing a walue. Currently such attributes are treated as a 
text and are not promoted nor the parameter Show_name_value controls their 
visibility.

2) Extend Visibility parameter with a new option (2) telling that the 
attribute is not visible but can be promoted. This means that the attribute 
is visible if visibility = 1  and promoted if is >= 1.  The change will make 
possible creating the attributes that are editable but not visible (even 
after editing). Now the attributes with visibility set to 0 are not promoted 
(as device attribute).

The changes should not cause compatibility problems.

W. Kazubski