[LATE FEATURE] Regression curve / trendline custom name

[Tomaž Vajngerl]

Hi,

I have implemented applying custom names to trendlines / regression
curves (show in legend) for charts in master. I would also like this
for LO 4.2 but I didn't make until feature freeze.

This is important for 2 reasons:
- old MS binary format and OOXML support this already, so this is an
compatibility improvement.
- in LO 4.2, the ODF format has been extended with additional
properties for regression curves and this change also needs a new
property. It would be easier if all the changes would be released in
one LO release as all the changes will also be together in the
specification proposal to OASIS.

Relevant commits are:
http://cgit.freedesktop.org/libreoffice/core/commit/?id=3af08dd27d45302d162974e671f50af8a11a9cea
http://cgit.freedesktop.org/libreoffice/core/commit/?id=f58e03e7bb0016c1ca789f7e7b35933c95378121
for dry cleanup
http://cgit.freedesktop.org/libreoffice/core/commit/?id=6f62f3f0af9ae8c1b00d0d620f306cae914a3861
main implementation
http://cgit.freedesktop.org/libreoffice/core/commit/?id=2b243ba51e786b0993e66232144fd6a6ee9ef724
ODF import/export
 http://cgit.freedesktop.org/libreoffice/core/commit/?id=c86aed38b67ee5d1b842a7765e363015aea22fcc
OOXML import/export
http://cgit.freedesktop.org/libreoffice/core/commit/?id=288719571eb617613ba9724f394a257a17d43a81
MS binary 2000/XP/2003 import/export

Regards, Tomaž