changepage – Mar­gin ad­just­ment and de­tec­tion of odd/even pages

The pack­age pro­vides com­mands to change the page lay­out in the mid­dle of a doc­u­ment, and to ro­bustly check for type­set­ting on odd or even pages. In­struc­tions for use are at the end of the file.
The pack­age is an ex­trac­tion of code from the mem­oir class, whose user in­ter­face it shares. It is in­tended the this pack­age will even­tu­ally re­place the chng­page pack­age, which is dis­tributed with the pack­age.