[varnamc] Added manpages for varnamc
[build] Added VARNAM_LIB_ARCH environment variable

Setting this variable affects the way libraries are installed. If this
is set, install will create a subdirectory inside "lib" with the
variable value.

This is useful for installing libvarnam on environments where MultiArch
is supported. Debian and Ubuntu requires this. So the packaging rule
file will set this directory to whatever architecture the build is
happening.
[build] Added uninstall target
[varnamc] Adding MultiArch directories to varnamc search path
[api] Fixing varnam_init_from_lang() to set errors correctly

When varnam_init_from_lang() fails during configuring suggestions due
to malformed database or anything like that, error message was not set
to the out parameter correctly. This commit fixes that.
varnam_init_from_lang will make the suggestions directory
[release] v3.1.3

* varnam_init_from_lang will make the suggestions directory
* Fixed varnam_init_from_lang() to set errors correctly
* Adding MultiArch directories to varnamc search path
* Added uninstall target
* MultiArch support to the build system
* Added manpages for varnamc