fix a weird compile error on a machine I tried to compile shogun on
fixed compiler issue with g++4.4
remove debug message and fix compiler error on g++4.4
some include guards to make compile possible when LAPACK is unavailable
remove double entry
another guard which allows things if lapack is not there
Merge pull request #1545 from lambday/feature/log_determinant

direct sparse linear system solver added using llt
Changes by 2to3 ran on tests/integration/python_modular
issue #1548
Merge pull request #1543 from karlnapf/develop

fix a weird compile error on a machine I tried to compile shogun on
comment how to use a custom python version
remove requirement for junj2 for unit testing
Merge pull request #1550 from karlnapf/develop

remove jinj2 requirement for unit tests and add comment in readme about custom python
added direct sparse linear solver and guard for eigen
little comment
Merge pull request #1551 from karlnapf/develop

expose direct sparse linear solver in modular interfaces
fixed copy paste error
Merge pull request #1552 from karlnapf/develop

fixed copy paste error
a couple of compile fixes if lapack is not available
Merge pull request #1554 from karlnapf/develop

a couple of compile fixes if lapack is not available
fixed spelling mistake in bss notebook