ENH: Updated CONESTA.
ENH: Updated CONESTA to latest version.
REFAC: Moved CONESTA algorithms to proximal.py. Updated doctests and unit tests.
WIP: Updates to CONESTA.
BUG: Fixed bug in dual gap of TV and GL. Updated stopping criterion in CONESTA and StaticCONESTA.
TEST: Fixed unit tests and some bugs.
TEST: Bug in unit tests.
TEST: Added unit test to the statistical measures in utils.stats. Also added some more measures.
BUG: Fixed two bugs in the excessive gap algorithm.
MAINT: Merge conflict.
TEST: Updated unit tests.
PERF: Attempt at speed-up of vector-scalar divisions.
MAINT: Bumped version to 0.2.1.
REFAC: Changed nesterov.function.A_from_* to nesterov.function.linear_operator_from_*.
TEST: Updated unit tests to use linear_operator_from_* instead of A_from_*.
ENH: CONESTA use curent mu as stoping criterium intsead of function.mu_opt(self.eps).
- Some refactorization of the algo: simplify variables names and suffix optional returned
information variable with "_" to  spot optional variables ex: mu_, t_, f_ are.
- Avoid unnecessary computation of the gap within CONESTA get it from the last FISTA
iteration.
Same modification for StaticCONESTA