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Refactor the DMA API to work on layouts internally. The resulting code
ends up simpler for most cases, as long as we add a generic copy
function.

One things missing:
- a good API to expose the collection of copy functions we have.

One question not solved:
- should the DMA ask for a copy function on each operation ?

Use the newly added INNER_MALLOC for all the relevant creators.

Removes static allocations of all objects from the library.
While this will make our code less compact in theory,
this part of the API is too confusing for new users.

Recursive makefiles do not propagation automake flags (AM_CFLAGS),
making the proper configuration of the whole build chain more complex
than it needs to be. This patch goes back to a single makefile.am in
src, simplifying the build quite a bit.

Less than perfect types for the most part, plus a few unused variables.

Implement #31 for vector.
Improve error management.
Checkpatch vector.

Implement #31 for dma.
Improve error management.
Checkpatch dma

Poorly supported feature that doesn't play well with the rest of the
library and limits what we can do in the future.

The overall strategy for now is to split the implementations into
distinct headers, but keep the generic APIs inside the main aml.h

Related to #27

Nicolas Denoyelle authored Mar 12, 2019 and Swann Perarnau committed Mar 13, 2019

- create one directory per building block in src and include
- keep one directory for tests, \
  otherwise automake make them "test suites"
- move to AC_OPENMP, which is from autoconf 2.62 (2008)