Fix eigen3 paths

[RMeli]

Fix #39

[codecov]

Codecov Report

Merging #44 into master will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
+ Coverage   97.93%   97.97%   +0.04%     
==========================================
  Files          20       20              
  Lines        2376     2376              
==========================================
+ Hits         2327     2328       +1     
+ Misses         49       48       -1

Impacted Files	Coverage Δ
src/test/connectivity_test.cpp	100% <ø> (ø)	⬆️
src/test/irc_test.cpp	100% <ø> (ø)	⬆️
src/test/io_test.cpp	100% <ø> (ø)	⬆️
src/test/mathtools_test.cpp	100% <ø> (ø)	⬆️
src/test/transformation_test.cpp	100% <ø> (ø)	⬆️
src/test/molecule_test.cpp	100% <ø> (ø)	⬆️
src/test/wilson_test.cpp	100% <ø> (ø)	⬆️
src/test/atom_test.cpp	100% <ø> (ø)	⬆️
src/test/linalg_test.cpp	100% <ø> (ø)	⬆️
include/libirc/linalg.h	100% <ø> (ø)	⬆️
... and 1 more

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