* [c_api] use all relevant flags in compilation
* [c_api] Remove redundant IndexIVFFlat declarations
- From IndexIVF_c.h, already declared in IndexIVFFlat_c.h
* [c_api] type changes
- replace `long` with a more suitable type
- provide definitions for `faiss_component_t` and `faiss_distance_t`
* [c_api] Define CFLAGS and CUDACFLAGS
* [c_api] Update impl and interface for v1.5
- move IndexShards to dedicated module IndexShards_c.{h|cpp}
- remove getter/setters to unreachable fields
- reimplement faiss_IndexIVF_imbalance_factor (to use invlists)
- minor IndexIVF documentation tweaks
- Remove QueryResult, provide RangeQueryResult
* [c_api] Document FaissErrorCode
* [c_api] Update GPU impl and interface for v1.5
- Remove unavailable method setTempMemoryFraction
* [c_api] Relicense to MIT
In accordance to the rest of the project
- change libfaiss_c.a libgpufaiss_c.a targets to only include wrapper
impl
- include libfaiss_c.a on c_api `make all`
- build libgpufaiss_c.so with libfaiss_c.a instead of faiss_c .o file list
Eduardo Pinho