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some configure cleanup as well as modification of darshan
linker flags when lustre module is enabled

Fixes #270

Error message below appeared when using autoconf 2.70.
./configure: line 4422: syntax error near unexpected token `newline'
./configure: line 4422: `    '''

fixes 287

Philip Carns authored Apr 26, 2020 and Shane Snyder committed Apr 26, 2020

closes #244

Philip Carns authored Mar 27, 2020 and Shane Snyder committed Mar 27, 2020

- for some platforms (particularly the Cray Programming Environment)
  this is sufficient to enable instrumentation on dynamically-linked
  executables with the current version of Darshan

Little guidance is given for what the the memory alignment value means
or how to determine it, so making it optional lowers a barrier to
getting started with darshan.

8 seems to be the common value for "--with-mem-align", so we make
it the default.

- also add option to disable "null" module for now

- add new --without-mpi to bypass all mpicc checks
- add --disable-xxx-mod to individually enable/disable each module
- add report of enabled/disabled modules at end of configure
- does NOT report compiler version yet
- does NOT report whether MPI is enabled or not yet

- also rename option for newer API
- make the two options mutually exclusive

This reverts commit 3f12e721.

(Previous stronger language was more accurate)