securehash: Keep module name consistent

1. All other modules don't use underscore, why this should be different?

2. Wrap some imports to 80 column

compiler/ast.nim

@@ -10,7 +10,7 @@
 # abstract syntax tree + symbol table
 
 import
-  msgs, hashes, nversion, options, strutils, secure_hash, ropes, idents, lists,
+  msgs, hashes, nversion, options, strutils, securehash, ropes, idents, lists,
   intsets, idgen
 
 type

compiler/cgen.nim

@@ -11,7 +11,7 @@
 
 import
   ast, astalgo, hashes, trees, platform, magicsys, extccomp, options, intsets,
-  nversion, nimsets, msgs, secure_hash, bitsets, idents, lists, types,
+  nversion, nimsets, msgs, securehash, bitsets, idents, lists, types,
   ccgutils, os, ropes, math, passes, rodread, wordrecg, treetab, cgmeth,
   condsyms, rodutils, renderer, idgen, cgendata, ccgmerge, semfold, aliases,
   lowerings, semparallel

compiler/extccomp.nim

@@ -13,7 +13,8 @@
 # nim files.
 
 import
-  lists, ropes, os, strutils, osproc, platform, condsyms, options, msgs, secure_hash
+  lists, ropes, os, strutils, osproc, platform, condsyms, options, msgs,
+  securehash
 
 type
   TSystemCC* = enum

compiler/jsgen.nim

@@ -31,7 +31,7 @@ implements the required case distinction.
 
 import
   ast, astalgo, strutils, hashes, trees, platform, magicsys, extccomp, options,
-  nversion, nimsets, msgs, secure_hash, bitsets, idents, lists, types, os,
+  nversion, nimsets, msgs, securehash, bitsets, idents, lists, types, os,
   times, ropes, math, passes, ccgutils, wordrecg, renderer, rodread, rodutils,
   intsets, cgmeth, lowerings
 

compiler/modules.nim

@@ -10,7 +10,7 @@
 ## implements the module handling
 
 import
-  ast, astalgo, magicsys, secure_hash, rodread, msgs, cgendata, sigmatch, options,
+  ast, astalgo, magicsys, securehash, rodread, msgs, cgendata, sigmatch, options,
   idents, os, lexer, idgen, passes, syntaxes, llstream
 
 type

compiler/rodread.nim

@@ -90,7 +90,7 @@
 
 import 
   os, options, strutils, nversion, ast, astalgo, msgs, platform, condsyms, 
-  ropes, idents, secure_hash, idgen, types, rodutils, memfiles
+  ropes, idents, securehash, idgen, types, rodutils, memfiles
 
 type 
   TReasonForRecompile* = enum ## all the reasons that can trigger recompilation

compiler/rodwrite.nim

@@ -13,7 +13,8 @@
 
 import 
   intsets, os, options, strutils, nversion, ast, astalgo, msgs, platform,
-  condsyms, ropes, idents, secure_hash, rodread, passes, importer, idgen, rodutils
+  condsyms, ropes, idents, securehash, rodread, passes, importer, idgen,
+  rodutils
 
 # implementation