[README] Update and change to markdown format
[doc] Fix doc regarding installation

o add missing file bat.eps
o remove installation instructions from introduction => maintain only INSTALL.md
o add BAT version to tex automatically
o gitignore tex intermediate files
[build] Towards passing `make distcheck`

o INSTALL.md, README.md added to source dist
o test's Makefile only not made is extra source build
o fix header include directory in Makefile.am's