Adding background content for each bin to summary page

This MR adds background contents (RATES, BACKGROUND_PDF_SNRCHI2, INJECTION_PDF_SNRCHI2, LR_SNRCHI2, ZERO_LAG_PDF_SNRCHI2) to summary page via image pagination component.

added 60 commits

• 1f0bf5fe...14d55733 - 54 commits from branch master
• db2faec5 - inspiral_pipe.py, gstlal_inspiral_pipe, gstlal_inspiral_summary_page:
• 6fa426fe - gstlal_inspiral_summary_page: add instrument name to the each SNR and chi-squared content.
• 8655bb26 - gstlal_inspiral_summary_page: forgot to replace ImageGrid to ImagePagination.
• faca9a09 - gstlal_inspiral_summary_page: forgot to change glob path.
• b9e6af8b - inspiral_pipe.py and gstlal_inspiral_pipe: cannot reuse the same job, create a new one instead.
• 689e086a - gstlal_inspiral_workflow and layers/inspiral.py: add new plotting layer that...

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requested review from @patrick.godwin

Hi Patrick, I wonder if it's possible to create some sub-directories in the plots directory.

Currently, the plotting layers that create the horizon distances and background PDFs will generate way too much more plots than before since they produce plots for each template bank bin now, it will be nice to organize these plots so that they live in their own directory.

added 1 commit

• 6298d999 - layers/inspiral.py: fix bugs related to plot_bin_background layer.

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resolved all threads

added 17 commits

• 6298d999...864ea918 - 10 commits from branch master
• 3778aadf - inspiral_pipe.py, gstlal_inspiral_pipe, gstlal_inspiral_summary_page:
• e55b8097 - gstlal_inspiral_summary_page: add instrument name to the each SNR and chi-squared content.
• d75756ec - gstlal_inspiral_summary_page: forgot to replace ImageGrid to ImagePagination.
• 71156a12 - gstlal_inspiral_summary_page: forgot to change glob path.
• 9d0baafa - inspiral_pipe.py and gstlal_inspiral_pipe: cannot reuse the same job, create a new one instead.
• ffe186fa - gstlal_inspiral_workflow and layers/inspiral.py: add new plotting layer that...
• 08768223 - layers/inspiral.py: fix bugs related to plot_bin_background layer.

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merged