Add back minimal version history for v1.90 through v1.93

source/install/versions/v190.md

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+(v190)=
+
+# Avogadro 1.90.0
+
+3 December 2016
+
+We are pleased to announce the latest release of Avogadro, including piles of
+bug fixes and feature enhancements.
+
+In particular v1.90 includes substantial improvements for handling crystallographic unit cells, including space group symmetry, and handling VASP calculations, as a result of a Google Summer of Code project of Patrick Avery.

source/install/versions/v191.md

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+(v191)=
+
+# Avogadro 1.91.0
+
+22 August 2018
+
+We are pleased to announce the latest release of Avogadro, including piles of
+bug fixes and feature enhancements.
+
+This release has a lot of new work completed over the last year, including the results of our first Google Summer of Code where two students worked on projects under the program.

source/install/versions/v192.md

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+(v192)=
+
+# Avogadro 1.92.0
+
+31 October 2018
+
+We are pleased to announce the latest release of Avogadro, including piles of
+bug fixes and feature enhancements.
+
+- Added support for the MMTF format form use with the Protein Data Bank
+- Added support for rendering atom forces
+- Added setting bond orders for common amino acid residues
+- New implementation of Python library using the Avogadro core for file IO and calculating orbitals and electron density

source/install/versions/v193.md

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+(v193)=
+
+# Avogadro 1.93.0
+
+5 February 2020
+
+We are pleased to announce the latest release of Avogadro, including piles of
+bug fixes and feature enhancements.
+
+- Support for Open Babel 3.0
+- New rendering using VTK including volumetric orbitals and electron density
+- Use VTK charts for rendering band structures and other plots
+- Use MongoChem to access databases from servers