Merge branch 'develop' into manpage
Add PNM loader imported from kmiya's sixel
Enable pnm format loader in loader.c
Minor fix
Build with frompnm.c
Don't use stbi_load_from_file
Add functions detect pnm/sixel image format
Do not use stbi loader if image format is pnm/sixel
Minor fix
Merge branch 'fix-segfault-without-arguments' into develop
Fix for some environment lacks memory.h
Add a template file for pkg-config integration
Add new config file libsixel.pc
Rebuild
Merge branch 'configure' into pkg-config-integration
Add new configure option, --with-pkgconfigdir
Update Makefile.am
Rebuild
Add new manpage "sixel(5)"
Install sixel(5) by default