some fixes for lecures swelect1-2

TATA54/MISC/find-primes-arit.sage

TATA54/MISC/find-primes-arit.sage~

homepage/img/15.png

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homepage/img/C44.png

homepage/img/DiffieHellman.png

homepage/img/Eisenstein-quadratic-reciprocity-1.svg.png

homepage/img/Eisenstein-quadratic-reciprocity-2.svg.png

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homepage/img/KBrepetition-1.png

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homepage/img/KBrepetition-3.png

homepage/img/KvadResBevis-1.png

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