New Features or Improvements:

• [major change]: rename glm_vec_ namespace to glm_vec3_
• new minadd, and maxadd functions for vectors
• new negate functions e.g. glm_vec3_negate() , glm_vec4_negate()

Bugfixes:

• fix versor alignment ( thanks to @sinisterchipmunk )
• fix glm_vec3_angle() if cosine is out of range, now it does not return NaN and more stable.

DEPRECATED:

• _flipsign and _inv functions for vectors are deprecated in favor of _negate function.