SciDAVis - Improvements SVN-temp

- Removed some hacks needed for old SIP/PyQt versions we no longer support.
While running SciDAVis with a different SIP version installed than the one it
was compiled against still doesn't work reliably, at least you get a proper
error message instead of a crash.
- Verified that this revision indeed works with SIP 4.6 and PyQt 4.2 (provided
you're also compiling against these versions).

- Moving data points by mouse doesn't take effect until you release the mouse
button, so as to produce only one undo command per move.

- fixed bug #2629678 "Move/Remove data point tools broken"
and some related issues

- Implemented update of table's type and formula control tab.
Closes bug #2605137.
- Changed formula control tab to apply to the whole column instead of selected
cells. 95% of the time it's what you want, so having to select the column
first is confusing and impractical. For the rest of the 5%, there's the
formula edit mode.
- Fixed crashes when doing exponential fits.

- fixed visual annoyance in the header of a table's first column

- Quick fix for duplicate state information of curves: Selecting "no symbol"
automatically changes curve type to "line"; selecting "no line" changes
curve type to "scatter". A clean solution would require removing either
"no symbol" and "no line" or "line" and "scatter" - not a good idea for a
bugfix release. Closes bug #2231471.
- Fixed setting of attributes for vector plots in PlotDialog.
- Added per mille and per ten thounds signs to SymbolDialog. Closes feature
request #2599846.

- Fixed saving and opening project files with function/fit curves, closing
bug #2616011. File format changed; opening code allows for changes to be
backported to 0.1 branch if we decide to make a 0.1.5 release. Because
0.2.0 crashes when trying to save function curves, there shouldn't be trouble
with backwards compatibility.

- Fixed opening of backup copy on discovery of a corrupt project file.
- Changed opening of compressed files to use a temporary file, eliminating the
risk of overwriting valuable data. Also, simply opening a compressed project
file no longer causes it to be rewritten.
- Opening of compressed files rewritten to use zlib directly instead of
minigzip, thus eliminating calls to exit() on error.

- Spanish translation update by Mauricio Troviano
- ASCII import sets the table's label to the file name again

- added Arch Linux to list of Linux distros known to have SciDAVis packages