Add device to maxima-load-pathname-directory.

Fixes the bug about loading compiled packages from a drive
which is different from the drive on which maxima is started.
Find pole at infinity

Fixes #2862 Incorrect result for integrate(u/(u+1)^2,u,0,inf);

src/defint.lisp:
o poles-in-interval: return pole at infinity, even when
  $csign tells us no poles strictly within interval

tests/rtestint.mac:
o add integrate(u/(u+1)^2,u,0,inf);
Add device to maxima-load-pathname-directory.

Fixes the bug about loading compiled packages from a drive
which is different from the drive on which maxima is started.
Merge branch 'master' of ssh://git.code.sf.net/p/maxima/code
Add *.ERR files to gitignore.
Updating only for equality to english.