Improve conversion of bytes to human readable string

Fixes issues like showing 0 MiB when the value is just slightly less then 1 MiB.

pglablib/pglablib.pro

@@ -87,7 +87,8 @@ SOURCES += \
     catalog/PgLanguage.cpp \
     catalog/PgAcl.cpp \
     catalog/PgSequence.cpp \
-    catalog/PgSequenceContainer.cpp
+    catalog/PgSequenceContainer.cpp \
+    utils/HumanReadableBytes.cpp
 
 HEADERS += \
         Pglablib.h \
@@ -119,7 +120,7 @@ HEADERS += \
     ui/catalog/tables/TableNode.h \
     ui/catalog/tables/TableSize.h \
     ui/catalog/tables/TableTreeBuilder.h \
-    util.h \ 
+    util.h \
     SqlFormattingUtils.h \
     catalog/PgCatalogTypes.h \
     catalog/PgKeywordList.h \
@@ -162,7 +163,8 @@ HEADERS += \
     catalog/PgLanguage.h \
     catalog/PgAcl.h \
     catalog/PgSequence.h \
-    catalog/PgSequenceContainer.h
+    catalog/PgSequenceContainer.h \
+    utils/HumanReadableBytes.h
 
 unix {
     target.path = /usr/lib