Add doc/create-image-expcorr; still a WIP

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+Create Exposure-Corrected Images
+================================
+
+1. Data reduction and create a basic manifest file (will be used by
+   subsequent tools):
+
+   ```sh
+   $ cd <obsid>
+   $ repro_acis.py
+   ```
+
+2. Clean the level=2 event file by removing point sources and flares:
+
+   ```sh
+   $ mkdir evt && cd evt
+   $ ln -s ../repro/*_repro_evt2.fits .
+   $ clean_evt2.py
+   $ cd ..
+   ```
+
+3. Get image grids (``xygrid`` output from ``get_fov_limits``):
+
+   ```sh
+   $ mkdir img && cd img
+   $ get_fov_limits "../repro/*_repro_fov1.fits[ccd_id=0:3]"  # ACIS-I
+   $ get_fov_limits "../repro/*_repro_fov1.fits[ccd_id=7]"  # ACIS-S
+   ```