Add download_hitemp files

Fixes #625

server/download_hitemp.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+"""
+Download HITEMP database, parse & cache them, to make sure the example notebooks run fast 
+"""
+
+from radis.test.utils import setup_test_line_databases
+from radis.io.hitemp import fetch_hitemp
+
+setup_test_line_databases()  # init radis.json etc if needed
+
+# Download other species
+for molecule in ["OH", "CO", "NO", "NO2"]:
+    print("Downloading and caching ", molecule)
+    fetch_hitemp(molecule, isotope='1',                   # only 1 HITEMP file so all isotopes are downloaded anyway
+                 load_wavenum_min=2000,  # keep memory usage low. only 1 HITEMP file so everything is downloaded anyway
+                 load_wavenum_max=5000,   
+                 verbose=3)
+
+# Not downloaded because to big for Binder / GESIS : CH4, N2O (we could actually try N2O)
+
+# Downloaded and computed separately: CO2, H2O

server/download_hitemp_CO2.py

@@ -0,0 +1,15 @@
+# -*- coding: utf-8 -*-
+"""
+Download HITEMP CO2 database, parse & cache them, to make sure the example notebooks run fast 
+"""
+
+from radis.test.utils import setup_test_line_databases
+from radis.io.hitemp import fetch_hitemp
+
+setup_test_line_databases()  # init radis.json etc if needed
+
+for (wmin, wmax) in [(k+50, k+1050) for k in range(0, 10000, 1000)]:
+    fetch_hitemp("CO2", isotope='1',                   # only 1 HITEMP file so all isotopes are downloaded anyway
+                 load_wavenum_min=wmin, 
+                 load_wavenum_max=wmax,   
+                 verbose=3)

server/download_hitemp_H2O.py

@@ -0,0 +1,48 @@
+# -*- coding: utf-8 -*-
+"""
+Download HITEMP H2O database, parse & cache them, to make sure the example notebooks run fast 
+"""
+
+from radis.test.utils import setup_test_line_databases
+from radis.io.hitemp import fetch_hitemp
+
+setup_test_line_databases()  # init radis.json etc if needed
+
+for (wmin, wmax) in [(0,     50),
+                    (50,    150),
+                    (150,   250),
+                    (250,   350),
+                    (350,   500),	 
+                    (500,   600),	 
+                    (600,   700),
+                    (700,   800),
+                    (800,   900),	 
+                    (900,   1000),	 
+                    (1000,  1150),	 
+                    (1150,  1300),	 
+                    (1300,  1500),	 
+                    (1500,  1750),	 
+                    (1750,  2000),	 
+                    (2000,  2250),	 
+                    (2250,  2500),
+                    (2500,  2750),
+                    (2750,  3000),
+                    (3000,  3250),
+                    (3250,  3500),
+                    (3500,  4150),	 
+                    (4150,  4500),
+                    (4500,  5000),
+                    (5000,  5500),	 
+                    (5500,  6000),
+                    (6000,  6500),
+                    (6500,  7000),
+                    (7000,  7500),
+                    (7500,  8000),
+                    (8000,  8500),
+                    (8500,  9000),
+                    (9000,  11000),	 
+                    (11000, 30000)]:
+    fetch_hitemp("H2O", isotope='1',                   # only 1 HITEMP file so all isotopes are downloaded anyway
+                 load_wavenum_min=wmin, 
+                 load_wavenum_max=wmax,   
+                 verbose=3)