change namespace from Dumux to Ewoms

eWoms hereby declares full independence. Humor aside, the main
technical advantage of this is, that it is now possible to easily
install both, Dumux and eWoms on a system using a package management
system without bad tricks.

doc/handbook/SVG/ewoms_structure.svg

@@ -15,7 +15,7 @@
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@@ -234,13 +234,13 @@
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@@ -298,7 +298,7 @@
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          id="flowPara3183"
-         style="font-size:12px">dumux</flowPara></flowRoot>    <flowRoot
+         style="font-size:12px">ewoms</flowPara></flowRoot>    <flowRoot
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@@ -663,7 +663,7 @@
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-         style="font-size:11px;text-align:start;text-anchor:start">Physical models using a sequentially (IMPET) discretization.</flowPara></flowRoot>    <flowRoot
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