Update DC2 tutorial notebooks with new datasets (Run2.1i)

[cnsetzer]

Initiated at the DESC Paris 2019 Hack Day, we are replacing the tutorial notebooks with datasets from Run2.1i.

To avoid duplicate work, in case others are replacing the datasets, I will begin with the object_gcr... notebooks. If getting to additional ones after or during the hack, I will comment here which those are that I am updating.

To make the updates easier I will include a checklist:

• [ ] dia_sn_vs_truth.ipynb
• [ ] dia_source_object_stamp.ipynb
• [ ] dm_butler_lensing_cuts.ipynb
• [ ] dm_butler_postage_stamps.ipynb
• [x] dm_butler_skymap.ipynb
• [x] extragalactic_gcr_cluster_colors.ipynb
• [x] extragalactic_gcr_cluster_members.ipynb
• [x] extragalactic_gcr_hod.ipynb
• [x] extragalactic_gcr_mass_relations.ipynb
• [x] extragalactic_gcr_redshift_dist.ipynb
• [ ] matching_fof.ipynb
• [ ] matching_stack.ipynb
• [x] object_gcr_1_intro.ipynb
• [x] object_gcr_2_lensing_cuts.ipynb
• [x] object_gcr_3_challeneges.ipynb
• [ ] object_gcr_4_photoz.ipynb
• [ ] object_pandas_stellar_locus.ipynb
• [ ] object_per_visit_postage_stamp.ipynb
• [ ] object_spark_1_intro.ipynb
• [ ] postgres_forcedsource.ipynb
• [ ] postgres_object_1_intro.ipynb
• [ ] postgres_object_2.ipynb
• [ ] truth_gcr_intro.ipynb
• [ ] truth_gcr_variables.ipynb

[cnsetzer]

Here I am making note of the tutorial notebooks which need GCRcatalogs, that are not currently available, to be updated:

• object_gcr_4_photoz.ipynb needs dc2_object_run2.1i_with_photoz
• dia_sn_vs_truth.ipynb needs dc2_truth_run2.1_variable_summary,dc2_truth_run2.1_variable_lightcurve, dc2_dia_source_run2.1i_test, dc2_dia_object_run2.1i_test
• dia_source_object_stamp.ipynb needs dc2_dia_source_run2.1i_test and dc2_dia_object_run2.1i_test
• matching_fof.ipynb needs dc2_truth_run2.1_static
• matching_stack.ipynb needs data in /global/projecta/projectdirs/lsst/global/in2p3/Run2.1/output/
• object_pandas_stellar_locus.ipynb needs data in /global/projecta/projectdirs/lsst/global/in2p3/Run2.1/output/
• object_spark_1_intro.ipynb needs data in '/global/projecta/projectdirs/lsst/global/in2p3/Run2.1/summary'
• truth_gcr_intro.ipynb needs dc2_truth_run2.1_static
• truth_gcr_variables.ipynb needs dc2_truth_run2.1_variables_summary

will continue to update as I continue through more notebooks

[yymao]

Partly fixed by #113, and superseded by #130.