[Patch] Hammers for tablature

[Lamy Jean-Baptiste]

Hi,

The following patch includes:

 * Support of hammers and pulls in tablature -- Hammers and pulls are
inserted exactly like slurs, and a "H" or a "P" is added over the slur as
needed.
The file ./input/test/tablature-hammer.ly is an example of hammer, pull and
legato in a tablature.

 * Stem.up-to-staff is now disabled by default, since it appears that most
of the published tablatures are not like that.

Jiba

tab-lily-hammer.patch
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