Merge pull request #111 from ghutchis/split-versions

Split version history to clarify v1 and v2 betas

source/install/versions/avogadro1.md

@@ -0,0 +1,37 @@
+(v1)=
+
+# Avogadro 1
+
+Avogadro was designed to be a cross-platform molecular editor and visualization tool. In particular, it was built on top of the [Open Babel](https://openbabel.org) open source cheminformatics toolkit to handle import and export, force field optimization, partial charge assignment and other tasks.
+
+The development and features of Avogadro were covered in:
+[Hanwell, M.D., Curtis, D.E., Lonie, D.C. et al. Avogadro: an advanced semantic chemical editor, visualization, and analysis platform. J Cheminform 4, 17 (2012).](https://doi.org/10.1186/1758-2946-4-17)
+
+```{toctree}
+---
+maxdepth: 1
+---
+v120
+v111
+v110
+v103
+v102
+v101
+v100
+v099
+v098
+v097
+v096
+v095
+v094
+v093
+v092
+v091
+v090
+v081
+v080
+v061
+v060
+v020
+v010
+```

source/install/versions/avogadro2.md

@@ -0,0 +1,25 @@
+(v2)=
+
+# Avogadro v2
+
+Avogadro 2 is currently in beta. It was re-written from scratch to address a number of issues with the [Avogadro v1](v1) codebase.
+
+Major concerns in Avogadro 1.0 focused on stability (i.e., crashes) and speed, particularly with molecules or systems over a few hundred atoms. **Avogadro v2 was designed for fast modern rendering and improved stability. It is a platform to make it easy to build the next generation of molecular and materials visualization and editing tools.**
+
+```{toctree}
+---
+maxdepth: 1
+---
+v199
+v1981
+v198
+v197
+v196
+v1951
+v195
+v194
+v193
+v192
+v191
+v190
+```

source/install/versions/index.md

@@ -7,7 +7,7 @@ previous versions of Avogadro (1.2 and older)
 
 ```{toctree}
 ---
-maxdepth: 1
+maxdepth: 2
 ---
 v199
 v1981