Handle expressions like pi or 3/2 in tides interfaces
removed unnecessary imports, used tmp_dir and other minor fixes.
Reverted RR(SR(foo)) trick, changed constant to match precission with TIDES
Use 10.9 as MACOSX_DEPLOYMENT_TARGET on 10.10
Slight simplification for meet-matrix.
Slight simplifying to _join.
Moved [meet|join]_matrix from posets to lattices and is_lattice from
categories to posets.py.
Let empty poset has [meet|join]matrix with 0 rows and columns.
First commit overwritting the method random_element of StandardTableaux_size.
Rollback: is_lattice() to categories.
Minor improvement on the documentation and on the way the method
generates a subset of a set.
Implementation of the random_element method of BinaryTrees_size.
Improvement on doctest.
minor modifications
doc only so far
Fixing a format problem with the documentation.
review
Put the import at the beggining of the method.
Trac #17204: OSX Yosemite libtool version detection

libtool picks the wrong linker flags as it misinterprets the 10.10
version number
* ​http://lists.gnu.org/archive/html/libtool-
patches/2014-09/msg00002.html
* ​https://gmplib.org/list-archives/gmp-bugs/2014-September/003534.html
* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63610

Note: the libtool.m4 macro may be found munged into the auto-generated
aclocal.m4 and configure.

The fix will be in libtool-2.4.3 to be released shortly.

URL: http://trac.sagemath.org/17204
Reported by: vbraun
Ticket author(s): Volker Braun
Reviewer(s): John Palmieri
Trac #17179: TIDES interface should convert exact parameters to floating points.

TIDES interface admits expressions like pi or 2^(1/7) as parameters.
They should be converted to floating point numbers of the appropiate
precission.

URL: http://trac.sagemath.org/17179
Reported by: mmarco
Ticket author(s): Miguel Marco
Reviewer(s): Jeroen Demeyer