[py][fix] Improved the speed of the db generation.

The problem was the search of the annotations in the eyes dataframe.
Made it faster by using the filename as index and creating series
instead of dataframes for each row.
4 jobs for fix-efficiency in 3 minutes and 25 seconds (queued for 1 second)
Name Stage Failure
failed
build_macosx_36 Build
Ran 1 test in 0.002s

FAILED (errors=1)
Tests failed for bob.db.morph-0.0.1b0-py36hdc21d39_0.conda - moving package to /Users/gitlab/builds/b6d3167a/0/bob/bob.db.morph/miniconda/conda-bld/broken
WARNING:conda_build.build:Tests failed for bob.db.morph-0.0.1b0-py36hdc21d39_0.conda - moving package to /Users/gitlab/builds/b6d3167a/0/bob/bob.db.morph/miniconda/conda-bld/broken
TESTS FAILED: bob.db.morph-0.0.1b0-py36hdc21d39_0.conda
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: exit status 1
failed
build_macosx_37 Build
Ran 1 test in 0.002s

FAILED (errors=1)
Tests failed for bob.db.morph-0.0.1b0-py37hdc21d39_0.conda - moving package to /Users/gitlab/builds/b6d3167a/1/bob/bob.db.morph/miniconda/conda-bld/broken
WARNING:conda_build.build:Tests failed for bob.db.morph-0.0.1b0-py37hdc21d39_0.conda - moving package to /Users/gitlab/builds/b6d3167a/1/bob/bob.db.morph/miniconda/conda-bld/broken
TESTS FAILED: bob.db.morph-0.0.1b0-py37hdc21d39_0.conda
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: exit status 1
failed
build_linux_36 Build
Ran 1 test in 0.003s

FAILED (errors=1)
Tests failed for bob.db.morph-0.0.1b0-py36hdc21d39_0.conda - moving package to /scratch/builds/bob/bob.db.morph/miniconda/conda-bld/broken
WARNING:conda_build.build:Tests failed for bob.db.morph-0.0.1b0-py36hdc21d39_0.conda - moving package to /scratch/builds/bob/bob.db.morph/miniconda/conda-bld/broken
TESTS FAILED: bob.db.morph-0.0.1b0-py36hdc21d39_0.conda
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: exit code 1
failed
build_linux_37 Build
Ran 1 test in 0.002s

FAILED (errors=1)
Tests failed for bob.db.morph-0.0.1b0-py37hdc21d39_0.conda - moving package to /scratch/builds/bob/bob.db.morph/miniconda/conda-bld/broken
WARNING:conda_build.build:Tests failed for bob.db.morph-0.0.1b0-py37hdc21d39_0.conda - moving package to /scratch/builds/bob/bob.db.morph/miniconda/conda-bld/broken
TESTS FAILED: bob.db.morph-0.0.1b0-py37hdc21d39_0.conda
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: exit code 1