Added introduction lecture (extracted from extended introduction).

introduction_extended/contig.png

-../presentation-pics/pics/contig.png
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introduction_extended/discordant.png

-../presentation-pics/pics/discordant.png
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introduction_extended/galaxy.xcf

-../presentation-pics/pics/galaxy.xcf
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introduction_extended/galaxy_mpileup.xcf

-../presentation-pics/pics/galaxy_mpileup.xcf
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introduction_extended/linker-clip.ppm

-../presentation-pics/pics/linker-clip.ppm
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introduction_extended/poorly_mapped.png

-../presentation-pics/pics/poorly_mapped.png
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introduction_extended/pretrimmed_qscores.png

-../presentation-pics/pics/pretrimmed_qscores.png
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introduction_extended/scaffold.jpg

-../presentation-pics/pics/scaffold.jpg
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introduction_extended/sv.jpg

-../presentation-pics/pics/sv.jpg
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