Merge branch 'develop' into release-0.19
Update minor version
Update configure script
Minor fix
Merge branch 'sandbox' into configure

Conflicts:
	configure.ac
Fix for environments that do not have pkg-config
Improve configure script avilability
Update build scripts
Merge branch 'fix-if-pkgconfig-is-unavilable' into configure
Merge branch 'configure' into kmiya
Merge branch 'kmiya' into sandbox
Merge branch 'sandbox' into release-0.19
Bump version
Rebuild configure script
Merge branch 'release-0.19' into develop
Drop the preparation for SIMD enhancement
Drop unused posix_memalign stub function
Rebuild configure script
Merge branch 'develop' into configure
Cleanup