Add YAML configuration files for SEVIRI M08 and M11 with Thinning and Quality Control (#40)

**Description:**
This PR adds YAML configuration files for `seviri_m08` and `seviri_m11`
into JEDI, along with thinning and observation quality control.
The the bufr2ioda python converter for these observations has also been
added to the GDASApp repository.

**Related Issue:**
[Evaluation of SEVIRI YAMLs
#756](NOAA-EMC/GDASApp#765)

**New files include:**
- `observation_chronicle/atmosphere/seviri_m08.yaml` 
- `observation_chronicle/atmosphere/seviri_m11.yaml` 
-  `observations/atmosphere/seviri_m08.yaml.j2` 
- `observations/atmosphere/seviri_m11.yaml.j2`

---------

Co-authored-by: Azadeh Gholoubi <gholoubi@hercules-login-2.hpc.msstate.edu>
Co-authored-by: Azadeh Gholoubi <gholoubi@hercules-login-4.hpc.msstate.edu>

Author: 3 people

observation_chronicle/atmosphere/seviri_m08.yaml

@@ -0,0 +1,25 @@
+# Instrument metadata
+# -------------------
+commissioned: 2012-05-22T00:00:00
+observer_type: satellite  # Type of chronicle to use
+
+# Instrument initial configuration
+# --------------------------------
+channel_variables:
+  simulated: min
+  active: min
+  biascorrtd: min
+  error: max
+  error_cld: max
+  ermax: max
+
+channel_values:
+#       sim act bcd  err   errcld  ermax    
+  4:  [  1, -1, -1,  1.80,  0.00,  2.00 ]
+  5:  [  1,  1, -1,  2.50,  0.00,  4.00 ]
+  6:  [  1,  1, -1,  2.25,  0.00,  3.50 ]
+  7:  [  1, -1, -1,  1.25,  0.00,  2.00 ]
+  8:  [  1, -1, -1,  1.25,  0.00,  2.00 ]
+  9:  [  1, -1, -1,  1.25,  0.00,  2.00 ]
+  10: [  1, -1, -1,  1.45,  0.00,  2.00 ]
+  11: [  1, -1, -1,  1.25,  0.00,  3.00 ]

observation_chronicle/atmosphere/seviri_m11.yaml

@@ -0,0 +1,25 @@
+# Instrument metadata
+# -------------------
+commissioned: 2019-06-12T00:00:00
+observer_type: satellite  # Type of chronicle to use
+
+# Instrument initial configuration
+# --------------------------------
+channel_variables:
+  simulated: min
+  active: min
+  biascorrtd: min
+  error: max
+  error_cld: max
+  ermax: max
+
+channel_values:
+#       sim act bcd   err   errcld  ermax    
+  4:   [  1, -1, -1,  0.75,  0.00,  2.00 ]
+  5:   [  1,  1, -1,  2.50,  0.00,  4.00 ]
+  6:   [  1,  1, -1,  2.25,  0.00,  3.50 ]
+  7:   [  1, -1, -1,  1.25,  0.00,  2.00 ]
+  8:   [  1, -1, -1,  1.25,  0.00,  2.00 ]
+  9:   [  1, -1, -1,  0.75,  0.00,  2.00 ]
+  10:  [  1, -1, -1,  0.80,  0.00,  2.00 ]
+  11:  [  1, -1, -1,  1.25,  0.00,  3.00 ]