A parameter instructing which arrays to allocate (or not) when creating a new configuration
(e.g. <tt>makecrystal</tt>) or reading one from file (e.g. <tt>readcn</tt>).

<p>
When <tt>SAVEMEMORY = 9</tt>, only arrays <tt>SR</tt> and <tt>fixed</tt> are allocated.  This 
allows a crystal to be created and written to a file.

<p>
When <tt>SAVEMEMORY = 8</tt>, arrays <tt>R</tt> and <tt>R0</tt> are allocated, in addition to
the above.

<p>
When <tt>SAVEMEMORY = 7</tt>, arrays <tt>F</tt>, <tt>EPOT_IND</tt> and <tt>species</tt>
are allocated, in addition to the above.  This allows the structure to be relaxed (e.g. <tt>relax</tt>).

<p>
When <tt>SAVEMEMORY = 6</tt>, arrays <tt>VR</tt> and <tt>VSR</tt>
are allocated, in addition to the above.  This allows simple MD simulation (e.g. <tt>run</tt>).

<p>
When <tt>SAVEMEMORY = 5</tt>, arrays <tt>image</tt>, <tt>TOPOL</tt> and <tt>group</tt>
are allocated, in addition to the above.  This allows the analysis and visualization of
the structure by central symmetry parameter (e.g. <tt>calcentralsymmetry</tt>).

<p>
When <tt>SAVEMEMORY = 4</tt>, arrays <tt>F0</tt> and <tt>Fext</tt>
are allocated, in addition to the above.  This allows external forces to be applied
 (e.g. <tt>enable_Fext</tt>).

<p>
When <tt>SAVEMEMORY = 1</tt> (default), all the remaining arrays, <tt>EPOT_RMV</tt>,
<tt>VIRIAL_IND</tt>, <tt>TORQUE_IND</tt> and <tt>BENDMOMENT_IND</tt>
are allocated, in addition to the above. 

